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A 38-year-old man has died following a mass shooting at a park in New York City. 

Eleven other people - including a child - were injured as a hail of gunfire erupted at Brownsville Playground in Brooklyn at around 11pm on Saturday night.  

The area was teeming with locals who were out celebrating 'Old Timers Week' - an annual community block party in its 56th year.  

A single shooter - still at large -  is believed to be responsible for the tragedy, according to The New York Post.   

Following the incident, scores of police and EMS response teams descended upon the area before victims were rushed to nearby hospitals.  

Detectives were seen pacing the area, with one abandoned firearm found among discarded cups and bottles that littered the ground following the festival. 

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Twelve people were shot at Brownsville Playground in Brooklyn on Saturday night following after a gunmen opened fire on patrons celebrating at an annual community block party

One woman was seen to be in a serious condition following the shooting as she was stretchered to an ambulance by an EMS worker

Scores of police and EMS response teams descended upon the area in the wake of the mass shooting rendering assistance to the victims

Several victims had to be rushed to hospital to be treated for injuries sustained in the mass shooting

A 38-year-old man died after sustaining gunshot wounds in the shooting, according to police sources 

Detectives were seen pacing the area, with one abandoned firearm found among discarded cups and bottles that littered the ground following the festival

One witness described the aftermath of the shooting as 'pure pandemonium' as stunned victims ran for cover 

Bystanders are seen shaken by the mass shooting - with the gunman responsible for the tragedy still at large as of early Sunday morning  

One witness told The New York Post that the gunfire came as a complete surprise - and didn't appear to be caused by an altercation. 

'I heard shots and I ducked. When I stuck my head up, and the smoke cleared, it was pure pandemonium,' he recalled. 

Mayor Bill de Blasio posted shortly after midnight on Sunday: 'We had a terrible shooting in Brownsville tonight that shattered a peaceful neighborhood event. Our hearts go out to the victims. 

'We will do everything in our power to keep this community safe and get guns off our streets.'

The 'Brownsville Old Timers Week' features food stalls and live entertainment, with a flyer posted on Facebook showing that the second part of the two-day event kicked off at 6pm on Saturday. 

Facebook photos posted just hours before the shooting show a tranquil scene, with dozens of people pictured enjoying the block party beneath leafy trees. 

Police have not revealed whether they currently have any suspects in relation to the deadly incident, and the situation is still developing.  

A heavy police presence was in place around Brownsville Park overnight

Brownsville Park was the site of the neighborhood's annual community block park 

At the time of the shooting, the area was teeming with people who were out celebrating 'Brownsville Old Timers Week'

An NYPD officer is seen combing the crime scene for clues early on Sunday morning after the area was cordoned off to the public

Mayor Bill de Blasio tweeted about the incident, describing it as 'terrible shooting' 

The 'Brownsville Old Timers Week' features food stalls and live entertainment, with a flyer posted on Facebook showing that the second part of the two-day event kicked off at 6pm on Saturday evening

Facebook photos posted just hours before the shooting show a tranquil scene, with dozens of people pictured enjoying the block party beneath leafy trees